semitone:
a pitch interval halfway between two whole tones.
Also called half step, half tone.
tone:
1) a musical sound of definite pitch, consisting of several relatively simple constituents called partial tones, the lowest of which is called the fundamental tone 2) an interval equivalent to two semitones; a whole tone; a whole step.
3) any of the nine melodies or tunes to which Gregorian plainsong psalms are sung.
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